THE ASSOCIATION BETWEEN SELENIUM AND HUMIC SUBSTANCES IN FORESTED ECOSYSTEMS - LABORATORY EVIDENCE

被引：89

作者：

GUSTAFSSON, JP ^{[1
]}

JOHNSSON, L ^{[1
]}

机构：

[1] DEPT SOIL SCI,S-75007 UPPSALA,SWEDEN

来源：

APPLIED ORGANOMETALLIC CHEMISTRY | 1994年 / 8卷 / 02期

关键词：

SELENIUM; HUMIC SUBSTANCES; SOILS; AQUATIC SYSTEMS; CONIFEROUS FORESTS;

D O I：

10.1002/aoc.590080209

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In the soils and aquatic systems of coniferous forests, selenium is usually associated with humic substances. To clarify further some of the mechanisms involved, labelled and unlabelled selenite were added to two forest floors and to a brown-water lake. Sequential extraction procedures and chromatographic methods were used to evaluate the resulting association between selenium and humic substances. It was observed that the forest floors fixed most of the added selenite by means of microbial reductive incorporation and that selenium was preferentially incorporated into low-molecular-weight fractions of the humic substances. By contrast, selenium reduction was much slower in the brown-water lake and instead, inorganic complexation of selenite to metal-humic complexes was important during the experiment, provided that the concentrations of competing ligands were low.

引用

页码：141 / 147

页数：7

共 24 条

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